In different sports when a sportsman wins four crowns, titles, medals, belts or another distinctions is called a Quadruple Champion.
The first ever man to earn that enormous distinction was Thomas Hearns on October 29, 1987. Hearns won his first four titles at the following divisions: Welterweight (147 lbs), Light Middleweight (154 lbs), Light Heavyweight (175 lbs) and Middleweight (160 lbs).
The second man was Ray Charles Leonard, who on November 7, 1998 won his first championships at Welterweight (147 lbs), Light Middleweight (154 lbs), Middleweight (160 lbs), Super Middleweight (168 lbs) and Light Heavyweight (175 lbs). There are five titles in five divisions but his case is extremely rare: Leonard fought for two different belts in two different weight divisions the same night: Super middleweight (168 lbs) and Light heavyweight (175 lbs) against Don Lalonde so any of the titles can be attached as his fourth title.
The legendary Leo Gamez was the first champion to win all the lightest divisions from Minimumweight (105 lbs), Light Flyweight (108 lbs), Flyweight (112 lbs) to Super Flyweight (115 lbs). Gamez did it on October 9, 2000.
Some boxers have managed to win four titles and become Quintuple Champions.
- List of boxing triple champions
- List of boxing quadruple champions
- List of boxing quintuple champions
- List of boxing sextuple champions
- List of boxing septuple champions
- List of boxing octuple champions
- List of The Ring world champions
- List of WBC world champions
- List of WBA world champions
- List of IBF world champions
- List of WBO world champions
- List of IBO world champions
- Boxrec.com - title search 
- Boxing Records 
- Saddoboxing 
- Yahoo - Boxing 
- IBHOF 
- Cyberboxingzone 
- True Champions Of Boxing